Process for clarifying water and purifying it from germs.



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Bonner GANS, or rannow, NEAR BERLI GERMANY, ASSIGNOR TO J. D. RIEDE'L' AKTIEuGEsnLLsoHArr, or BERLIN, GERMANY, A JOINT STOCK COMPANY,

, raoonssroa etanrrvrliawarus am) runrrrrne 1r neon sear/re.

No Drawing.

To all whom it may concern subject of the German Emperor, residing at Pankow, near Berlin, Germany. have m vented a certain new and useful Process for Clarifying Water and for Purifying it'from Germs, of which the following is a specification. i It is known, that water can be relieved ofinorganic and organic matter and also or; game germs, by preducmg precipitates in the water'to be purified, by means of suit-' able additions, such assul-fate of alumina, which acts on the water either alone or wlth the aid of llme, so as to form precipitates,

' and the germs, so that a clear water free from germsv may be-obtained by filtration. This treatment, however, has the defect, that only a low speed of filtration (about tmeters per hour) may be used, that with a higher speed of filtration the precipitate is forced through the filter, that the filter is rapidly cloggedby the voluminous precipitate, so' that it has to be rinsed after about 6-hours, and that in the case of soft water the addition of lime will increase the hardness of the water. As a matter of fact,

3d ter may be sterilized, either by filtration over oxidized oxids of manganese in con JUIlCiZlOIl with natural or artlficlal zeolites,

or after the addition of permanganates excess, over reduced oxlds of manganese in conjunction with natural or artificial zeolit es. Tn the first case, however, steriliza-, tion is produced without s ufli cienticlarifica tion, and in the second case the addition of an excess of permanganate increases the expense of the process. All these evils may be avoided, where oxidized or reduced oxide of manganese without zeolites or in conjunction with zeolites are employed, by producingin the water to beclarified and sterilized 'a collodial solution of oxide of manganese,

which by other methods of filtration are difficult to separate, which may be effected by adding to the water either permanganates alone but not in excess, or permanganates and manganous salts in anyconvenient or: der of succession. The separation of these oxids of manganese in the shape of flakes. had better be avoided, and the formation of the collodial solution should therefore be efiec ted only a short time before filtration.

During the filtration through the oxidized Specification of Letters Patent.

Patented Dec. tars.

' Application filed December 12, 1910'. Serial lie. 596,884..

v w t or reduced oxids of manganese without ze-, Be 1t known that'I, Dr. ROBERT GANS, a

clog the filter, they are easily permeable for water and allow speeds of filtration of 25 meters and upward perhour. the quantity of permanganate added is considerably less than with other methods.

Example I: In dealing .with water. con-' tainin manganese, .a very small addition of perma ganate to the water is suiiicicnt. for instance water'containing from 2 to 3 milligrams of manganous oxid por'liter requires only the addition of about 0.6 milligrams of potassium permanganate per liter, but more or less may be used. This addition, which is' theoretically: suflicient' for precipitating about 0.4 milligrams 'of manganous oxid, forms with the manganous salts ofthe water a colloidal solution, which can be easilyremoved by filtration over oxidized oxids of manganese without zeolites or in conjunction with zeolites, inasmuch as they form a Moreover,

deposit on the zeolites containing manganese.

from germs. I r

In case the water does not contain any manganons oxi'd, about l-2 milligrams or upward of manganous oxid are addedand the process is carried out as above.

; Example II: lVater free from manganese may be converted into water containing manganese, by adding 0.5 to 5 milligrams or more of permanganate per liter, if .as is mostly the case, the water contains reduced The filtered water is clear and free organic substances, which convert the perj manganate partly into manganous salt and consequently into a colloidal solution. This addition is altogether insuilicicnt for relieving the water of its germs bysterilization by the old method, which requires an excess of permanganate. The filtration takes place over reduced ox'ids of manganese. The addition of permanganate should take place shortly before filtration, in order to prevent a complete reduction of the permanganate. Ifit'i's-desired, however, to accelerate the full reduction and with it the formation of oxid of manganese, substantially as described.

3. The process for clarifying water and for purifying it from germs, which consists in producing-in the water a colloidal solution of manganese by the addition of a permanganate and a manganous salt and then filter ng it over an oxid of manganese, sub

stantially as described.

4. The process for clarifying water and for purifying it from germs, which consists in producing in the water a colloidal solu tion of manganese, andthen filtering it over an oxidized oXid of manganese, substantially as described.

5. The process for clarifying water and for purifying it of germs, which consists in producing in the watera colloidal solution of manganese and then filtering over an oXid of manganese,'in conjunction with zeolite, substantially as described. j

6 The process for clarifying and sterilizing water, which consists in producing in the water a colloidal solution of manganese by the addition of a permanganate, and then passing it through a filtering medium consisting of an oxidized oxid of manganese and a zeolite, substantially as described.

In testimony whereof I'have hereunto set my hand in presence of two subscribing witnesses.

DR. ROBERT GANS.

lVitnesses HEINRICH KRIEcsHEnr,

VELDEMER Karissa, 

